Question: Who is the {human} for {relative} of {Joseph Conrad}
Paraphrase: Who is the { human } for Joseph Conrad's { relative }
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P1038 wd:Q82925 . ?sbj wdt:P31 wd:Q5 } 
Answer: Tadeusz Bobrowski, Stefan Bobrowski, Aniela Zagórska